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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 30, 2017
Allowance for Doubtful Accounts Activity | Activity in the allowance for doubtful accounts is as follows (amounts in thousands):
|  | Beginning Balance |  |  | Charged to Expense |  |  | Write-Offs and Other |  |  | Ending Balance |
Fiscal 2017 |  | $ | 1,703 |  |  | $ | 4,215 |  |  | $ | 2,764 |  |  | $ | 3,154 |
Fiscal 2016 |  | $ | 1,341 |  |  | $ | 3,365 |  |  | $ | 3,003 |  |  | $ | 1,703 |
Fiscal 2015 |  | $ | 2,723 |  |  | $ | 2,395 |  |  | $ | 3,777 |  |  | $ | 1,341 |
Weighted Percentage of Sales from Largest Customers | Our largest customer, Walmart/Sam’s Club, weighted percent of sales for fiscal years 2017, 2016 and 2015 was as follows:
|  | Percent of Sales |
|  | DSD Segment |  |  | Warehouse Segment |  |  | Total |
Fiscal 2017 |  |  | 17.6 | % |  |  | 2.4 | % |  |  | 20.0 | %
Fiscal 2016 |  |  | 17.0 | % |  |  | 2.6 | % |  |  | 19.6 | %
Fiscal 2015 |  |  | 16.7 | % |  |  | 2.6 | % |  |  | 19.3 | %
Estimated Useful Lives by Property Plant and Equipment Class | The table below presents the range of estimated useful lives by property, plant and equipment class.
|  | Useful life term (years)
Asset Class |  | Low |  | High
Buildings |  | 10 |  | 40
Machinery and equipment |  | 3 |  | 25
Furniture, fixtures and transportation equipment |  | 3 |  | 15
Schedule of Depreciation Expense | Depreciation expense for fiscal years 2017, 2016, and 2015 was as follows (amounts in thousands):
|  | Depreciation expense |
Fiscal 2017 |  | $ | 119,445 |
Fiscal 2016 |  | $ | 116,367 |
Fiscal 2015 |  | $ | 116,772 |
Inventory Valuation Reserve |
Summary of Valuation Allowance | Activity in the inventory reserve allowance is as follows (amounts in thousands):
|  | Beginning Balance |  |  | Charged to Expense |  |  | Write-Offs and Other |  |  | Ending Balance |
Fiscal 2017 |  | $ | 1,090 |  |  | $ | 1,684 |  |  | $ | 2,101 |  |  | $ | 673 |
Fiscal 2016 |  | $ | 238 |  |  | $ | 1,324 |  |  | $ | 472 |  |  | $ | 1,090 |
Fiscal 2015 |  | $ | 159 |  |  | $ | 776 |  |  | $ | 697 |  |  | $ | 238 |
Valuation Allowance of Deferred Tax Assets |
Summary of Valuation Allowance | The deductions column in the table below presents the amounts reduced in the deferred tax asset valuation allowance that were recorded to, and included as part of, deferred tax expense. The additions column represents amounts that increased the allowance. Activity in the deferred tax asset valuation allowance is as follows (amounts in thousands):
|  | Beginning Balance |  |  | Deductions |  |  | Additions |  |  | Ending Balance |
Fiscal 2017 |  | $ | 18 |  |  | $ | — |  |  | $ | 93 |  |  | $ | 111 |
Fiscal 2016 |  | $ | 18 |  |  | $ | — |  |  | $ | — |  |  | $ | 18 |
Fiscal 2015 |  | $ | 2,534 |  |  | $ | 2,516 |  |  | $ | — |  |  | $ | 18 |

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- Definition Tabular disclosure of credit losses for current financing receivables (such as trade and accounts receivable), including a rollforward of the balance. An alternative caption includes allowance for doubtful accounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer. + References No definition available. + Details
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